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The current Windows build used 2-byte unicode chars because that is what Windows does. In 3.3, all builds will use a new unicode implementation that uses 1,2,or4 bytes as needed. But I suspect we will still have the paste problem unless we can somehow bypass the tk limitation.
Printing a Python string to the screen does not seem to involve conversion to a tk string. Or else tk blindly copies surrogate pairs to Windows even though it cannot create them.
In any case, true window-closing crashes (as opposed to an error traceback) are obnoxious bugs that we try to fix if possible. I verified this on my 64-bit Win 7 system. Thanks for the report. Feel free to look into the code if you can.